Table 2: Values of exponents (slope the straight line) and of the linear correlation coefficient .

Substrates Exponents Correlation coefficient Glass/MPS/Gold (5.1 nm) 0.04 0.99 Glass/MPS/Gold (21.2 nm) 0.065 0.97 Glass/MPS/Gold/Dithiol/Gold (4.8 nm) 0.072 0.99 Glass/MPS/Gold//Gold (5.4 nm) 0.19 0.97 Glass/MPS/Gold//Gold (5.25 nm) 0.16 0.96 Glass/MPS/Gold/Dithiol/Gold/Hexadecanethiol 0.11 0.99